<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>

<head>
    <title> New Document </title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="Generator" content="EditPlus">
    <meta name="Author" content="xinmingyang">
    <meta name="Keywords" content="">
    <meta name="Description" content="">
</head>

<body>
    <SCRIPT language=JavaScript>
        var st = new Date();
    </SCRIPT>
    <IMG alt="测试图片" src="http://sp2.yokacdn.com/photos/f3/4f/702018/photo_322092_500.jpg" onload="showspeed();">
    <div id='showtxt'></div>
    <script>
        var arr = ["网速低于50KB", "网速在50-100KB之间", "网速在100-200KB之间", "网速在200-300KB之间", "视频通讯"];
        function showspeed() {
            var filesize = 35.4;    //measured in KB   
            var et = new Date();
            var speed = Math.round(filesize * 1000) / (et - st);
            document.title = speed;
            var scope = (speed > 0 && speed <= 50) ? 0 : (speed > 50 && speed <= 100) ? 1 : (speed >= 100 && speed < 200) ? 2 : (speed >= 200 && speed < 300) ? 3 : 4;
            alert(scope)
            document.getElementById("showtxt").innerHTML = ("您的下载速度为：" + arr[scope] + " (K/秒)")
        }  
    </script>
</body>

</html>